Hey cuzzins. I have a AR-15 post ban 16in. heavy barreled carbine.I LOVE THE DANG THING!!She shoots lights out, never fails to fire,feed or function (even when very dirty). Ma question ta all ya AR experts is: How do ya tighten up the buttstock to tha lower half? She's jest a tad loose, not bad at all, but it bugs me suppin fierce sumtimes. Sorry ta be such a stupid rube, but I's jest a dumb ol country boy. I'm sure tha fix is easy an obvious, but it has escaped yer ol cuzzin. Thanks in advance cuzzins,Mitch Here's a pic of my AR carbine.Later cuzzzins.